This method is called when the puzzle has been solved. It has two jobs: call the solution observer callback, and increment the number of solutions found.
# - - - S u d o k u S o l v e r . _ _ s o l u t i o n - - - def __solution ( self ): """A solution has been found. [ if self.solutionObserver is not None -> call self.solutionObserver(self) in any case -> self.nSolutions +:= 1 ] """ #-- 1 -- self.nSolutions += 1 #-- 2 -- if self.solutionObserver is not None: self.solutionObserver(self)